New Zealand Journal of Geology and Geophysics abstracts

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The Warder Formation: cyclic fluvial sedimentation during the Ngaterian (late Albian-Cenomanian) of Marlborough, New Zealand

G. H. BROWNE

DSIR Geology and Geophysics
P.O. Box 29 181
Christchurch, New Zealand*

M. B. REAY

DSIR Geology and Geophysics
P.O. Box 30 368
Lower Hutt, New Zealand*

*Present address: Institute of Geological and Nuclear Sciences Ltd, P.O. Box 30 368, Lower Hutt, New Zealand.

Abstract The Warder Formation of Ngaterian (late Albian-Cenomanian) age crops out in southern Marlborough, New Zealand. Outcrops are characterised by fining-upward alluvial cycles deposited by easterly flowing rivers on a coastal plain. Within-channel deposits include clast-supported conglomerate and trough cross-bedded sandstone, overlain by alternating sandstone and siltstone, lateral accretion (inclined heterolithic stratification) beds, in turn overlain by siltstone and claystone. The fine-grained units are interpreted as lacustrine sediments deposited in ox-bow lakes through meander loop cut-off. All outcrops are fault bounded, so a complete pattern of fluvial reconstruction cannot be made. The rivers which deposited the Warder Formation had a mean sinuosity of 1.5 and a discharge of 72-102 m³/s. Sedimentation was terminated by the eruption of alkaline basalts related to regional sea-floor spreading.

Keywords Marlborough; Clarence valley; fluvial sedimentation; paleohydrology; Ngaterian; Infomap 260 O31

Received 10 July 1992; published 13 April 1993
New Zealand Journal of Geology & Geophysics, 1991, Vol. 36: 27—35
0028Ð8306/06/3601—0027 ©The Royal Society of New Zealand 1991

PDF file of entire paper: medium quality (3182K); (scanned from paper original: notes about this process). Digitisation of this article from the printed journal was kindly facilitated by the Geological Society of New Zealand

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